2023-2024 Audi Engine Start System Fault TSB 2071735/6

Owners of certain 2023-2024 Audi vehicles may encounter an "Engine start system: fault" or "Power unit start system: fault" message appearing in their instrument cluster. This issue, while alarming, typically does not indicate any functional problems with the vehicle's engine start system. Audi has issued Technical Service Bulletin (TSB) 2071735/6 to address this specific concern, which is often accompanied by Diagnostic Trouble Code (DTC) B200047.

This TSB, identified as 57 24 49 2071735/6, supersedes a previous bulletin, 24-41, dated May 14, 2024. The primary cause of the Audi engine start system fault B200047 is a software anomaly within the Comfort Control Module, also known as -J393- (address word 0046).

Symptoms Owners May Notice

The most common symptom is a warning message displayed on the instrument cluster. Owners will see one of the following verbatim messages:

• "Engine start system: fault"
• "Power unit start system: fault"

Crucially, despite these warnings, the vehicle's engine start system will typically function without any actual issues. This indicates a reporting error rather than a mechanical failure.

Fault Codes / DTCs

When scanned, the Comfort Control Module (-J393-, address word 0046) will store a specific Diagnostic Trouble Code (DTC) related to this condition:

Code	Description	Symptom Code
B200047	Control Module Faulty	65552

This DTC B200047, combined with symptom 65552, points directly to the software issue within the Comfort Control Module.

Diagnosis and Trigger Conditions

Diagnosis involves checking for the presence of DTC B200047 in the Comfort Control Module (-J393-). The fault is described as active/static, meaning it is currently present and not intermittent. The TSB confirms that the root cause is a software issue within this module.

Repair Procedure Summary

The resolution for the Audi engine start system fault B200047 involves a software update to the Comfort Control Module (-J393-). Technicians should follow these general steps:

1. Refer to TSB 2011732: 00 Software Version Management (SVM), operating instructions, for detailed guidance on the SVM process.
2. Update the Comfort Control Module (-J393-, address word 0046) to software version 0630 or higher. This update is performed using the SVM action code 46A034.

For specific models, the software part numbers and versions are:

• A4, A5, Q7, and Q8: Old Software Part Number 8W1.907.064.* (version 0627) will be updated to New Software Part Number 8W1.907.064.* (version 0630 or higher).
• e-tron GT: Old Software Part Number 992.907.064.* (version 0627) will be updated to New Software Part Number 992.907.064.* (version 0630 or higher).

Important Warnings

During the software update process, it is critical to observe the following instruction:

• NOTICE: The key must be on the emergency reader coil during the update.

Failure to follow this instruction could lead to complications during the software programming.

Warranty Information

This repair is covered under Audi's warranty policy for vehicles up to 48 months or 50,000 miles. For Certified Pre-Owned (CPO) vehicles, coverage falls under G10 after owner verification. If the vehicle is outside of any applicable warranty, this Technical Service Bulletin serves as informational guidance, and the repair costs may not be covered.

The Service Number for this bulletin is 5789, and the Damage Code is 0039. Labor operations include Software Update (0151 0010 or 0151 0060, which includes checking for DTCs) and Vehicle Check (0689 0199).

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Source: NHTSA ID: 11005900